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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97b36ae10e4e941a016271afdbf31510362e1e5cb9b6b04946f0fd47eabbd6f' 
  AND token = 'ljuMwyWiRckCpgh1GyQO24RgIM44eJnYXuGng/Y8u3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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