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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c266d3a1ba31d4f984399d9169a1d438f0e5957ddb159751a0680d13a69cd14' 
  AND token = '1ePS6OT0lHFZBX5dSChN0KBz4md00L2IbhLE8yU19tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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