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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbafb12f6f431750fabdf3cba20c9afbc82141f9fccd86b3ca604c4dc47cdb1' 
  AND token = 'e/mOU0XdcHE9i57WeAfsk3sxJ8f9pQ2vFKIJR4N+VeU=' 
  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"
    }
  }
}