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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c524323bbc52d6c1099f26101e78715d75e6deae3508770a031e5ad4ec0b8c3' 
  AND token = 'Y3dL/y0izw3m0dUW/EwKnrABAXssSV67PkLSx8uHzwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}