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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebbe29ce12fe613f31ec620c8cdf63d7bce1283d54011584d5bfd8b4413e8cb' 
  AND token = '2s+4d9hJBmNZjc75WfAdSnbHG+ZxCS8zdlUybTgStV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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