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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93d9fdf3c8a6d203f1eab3c31c5784d32a2b3381f9740b66a6d15f3991a0245' 
  AND token = 'eEY77ZBr+SLztsoqffP1sm72JYOo/cXBswmqF6ZMx6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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