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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d13329a4a6b2e77eeffc77bcf8a2b37e1557bac4ec4fc483e0161d52bf91192' 
  AND token = 'Q7eKoEhSNfIEXDH1cDvvEYXz+9sT6ksNRw3AmvLrPGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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