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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff94a21c5c3a3f8862c07229447f9f0f5048d0e6049ec881ed5c477e9e16c27' 
  AND token = 'A+ELJ+8AW/nSU3THTQXVdQ0D4lav/7q7I5QMJWH8yoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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