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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b275be8cd9d445f9e21cf1cc10b6f59eff902adc341e71937cff100fe7281ff' 
  AND token = 'Jx150j7VE/3hbi4GsJcsqEuxW8+k5cq2Jce+8IcQJDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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