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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0255f14721710bb372e5ac7320ff5a1c62288d26f890b9c171e3ea739b04ba6' 
  AND token = 'PNPtPmNjWi6L2ZxqXp1v+0cApzR5VywrRORo4eRXsOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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