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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7167b6cc967f0a938f0d3dd9e31102b56e17ec98820fe43b35df0cee63e9b1d3' 
  AND token = 'Zzn7V7ck2dXjMU4aK/mMuhNvKxhGKYNdVGnCTffaTFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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