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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28df19fee2a974d42ba19c19785685441313517297ddfd44c94bb4025f7ff55f' 
  AND token = '9NSd0yppIu+qD4qWedScHQtlJ+ILEV+12iYYaRMXh2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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