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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b5939e53239ab76b2b951fd1bf35b53e6288f61fb57b1bce70db3503072f97' 
  AND token = 'P6SjFQ58CVZNhwYx5mRit6m35Q9/kOIjzHSrdZ/iECo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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