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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e02bb6bace7ebcfa436664fae5ccde4e7a2073a28651524dc2e7f0800073850' 
  AND token = 'a/P7kE3qIM9Ih7e4hGYHh/d/cup2eYqy31w2ho0MuNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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