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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ede47a733e11fea2aa87e55fc21c974c5c0e966afcfe9f7c27ac3ebe75abf2' 
  AND token = 'ssXQ9PSycDscp8QUlbJjmf3L6oCV9rV/HddlwMdqabQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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