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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5277ca9e7849f93c397fb3c53b9bfcf43fd144dc80224d9e223cb84df936a370' 
  AND token = 'f0UPlUUnXSxULUqb+yhm6C+ECKLdEnueu3ACpUAcZLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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