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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c051926644663ebc8052bd1d5af637b9787e009b60f58c2f0c42700e3fa981' 
  AND token = 'Lrtwew7e1/p67GVuhP7TibajA+p2ixDJ7ZtMLMPLH8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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