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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2d068feab76770314285edb71a4d334adf513062a35aec72e0fd7d92b04c1c' 
  AND token = 'c8CM7Doo8Xpvn/z241fsTbZJzzA9HDAeGkMthH4Th0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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