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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc12c99858d0b09e97b2f4259e970ace0d60c6aebacfead4bc0648787dbf6b2b' 
  AND token = '4LhPYAZFBs8rcTelDiDL/bE71+j3fmQI7wYQ9VL16ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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