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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf9138ed6af9eb5ac633d7764fe54b9c76d287c49d57177d05821420e7d65bb' 
  AND token = '5BFyu4DxPqV1fvv1IAIm4XLvnaZYPcMr1R2M8Ffo1iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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