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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96a5700f3a9a6715fad09d0982e65ccd2b5e55c25e09ff7a3ac7161740c6d10' 
  AND token = 'yGTRaHLWrkSaFK3VRKw8mcl4cgLdTC+xa4M8K8ZxCg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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