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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56830b38a5794a32af0b0ca60c9477d9e484c595a77f06bafc224379e8c1bd8d' 
  AND token = '8kcz7BRmPVvH43+20N5ng81o09QSMS6lNkDX4a0ngXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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