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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2a1a48cea514f3dbf7d57520ae45067226848158295e98fd30bb5d4f2d7efc' 
  AND token = 'N+rzxIO26jgkds3S1y9oznnFXdauTr9a8uss9Hz/eDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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