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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8b88051ad1c6bc7c78e5db79244f084439fd5537ffc3a0a5a3baf01aa77020' 
  AND token = 'gCv2hIC82QMYFL2HUpzJggFNCzvO7tqvIKY362ReR4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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