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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b0c473e1bb5b15ed05d0be374d7559037d0644eb4e45c32396e8bef152ab0e' 
  AND token = '5tKDpkDmUsS4oHEWH7BWeHSXc5qL4RHiQ8uZ/coi7ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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