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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f809e586d674dfd8cda7eba9f496de2ffabd38158ccb8b9dab9cc99de8138c6' 
  AND token = 'U5+F5W/k0C90SHhRzETiWaSeaPqjDsFSyjgL2R1Bbgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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