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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903effdd6ca5bdb5aad9cf0ffba47245f93527f2b89bafb195818b3ef6f0cc35' 
  AND token = 'o4XlJcSfw+4EDzG0pBmHuZDQl9Q5SzCG0b3oDZ4zV0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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