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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d8b9c89fc2b21294142774868ca3060c351772ab2dafced011f526bc5a7478' 
  AND token = 'j98bx1iy4S/SjAYTFNKymIunXC7z1WA4F0JE6eviXkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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