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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6364dc5b3b42479a48224f0aaa3d37c20ae03f5e8e971d7f9805e84a947fae4d' 
  AND token = 'OHRwbKhzxeIu4ZMCpZdVTo+I7Gn3K9Cae/xOBzXGXBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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