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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c25daa33401ef3d76bcd10560ac838d269340377b2c9f29546c0038796d92a1' 
  AND token = 'eEmam+I5m9YffPAHXbF+qIJH7fGn44kkQXQ30Ig1oTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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