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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862a0f6ac10fbf554ef41e4057e2f7d133bb8b0e72efca54eabe3ac1462062c2' 
  AND token = 'g+Dj88JprmVxoG4pzDIzRaTwFtTs6vfKDTW7HQCaN14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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