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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a4176ef08f3c3d4acb55419a6a4259dee0a2a1ad8031382ff4b183b8f525d6' 
  AND token = 'ENYoV72bLeX3fJXOwACX/NxQkuga6GLu5I2a5a6kp2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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