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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e79edbb700e551ece157357c0de54f1371f2cf41d5aafeec5615eea34b0a80' 
  AND token = 'okn8lljnSSaRoO1CmHxt1X3cY0Rtre+QBypzgdcZfbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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