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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26f4130a3b7c4bc0c06b5c3db47b29b6ca39917bea02b12e83df75a3608b1b0' 
  AND token = 'INNfViM6qlznT7lAJC3AgpaMzgKssE+3spTsPGzgfes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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