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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc38560c6ebde8b54d0ade0202eba94a44e4e5d2a5efaa75edb15ce058d8a74b' 
  AND token = '4RhBXpfVNJNpO41BiWE5gp2J+vpaoYDmXF6afQY2AJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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