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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9bc10b1ba6ee5170cd800b7e356c4fbeadbee4fbe06d1238a35f3e9373dcc66' 
  AND token = 'tEx6J2ItAsnkLoAkV421fEb4vhTyJFO++CsSPljPkgY=' 
  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"
    }
  }
}