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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f142392829e4f9a31bb541d18deab083912926952c3dad7c825e84c751fec2' 
  AND token = 'EH54YH7y5g5bPae84a2nT8rn8kd/3wDqL1XtN6mdN6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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