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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6c8685f39cb0d4fa92067b5a18896bf544784219d455ca5cd4f33f60b8d5e9' 
  AND token = 'ceqLAWdq0dSnA/NMPH+Dd/yX3SSNWaZw9cz2XuKxACs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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