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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd342a1ee0d9611d129dd66d8f885acbea6d3df5776f3b8627358ff5b4fc756bb' 
  AND token = 'mvKTM44mbC35e4LyKqZ+8g7q5ddkaI1aYLTjlPXBPUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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