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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feded04f60fda8c46e73b85ea856f3b66790ebe85f46ef2ce6c1637d2c5da85f' 
  AND token = 'i1arnBjHQecuiqPU8lmbc9CKVNF92u5TS+YBI9urNPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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