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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9adb51e4c5936dfc5a7762690f4d502d7cf697493380b720cf6cfa92e9f33311' 
  AND token = '7RAyamK4Is5tvYCJwnahP31Mt0kkGLwW1+NMlza4oCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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