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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49398fd1634b803690e2fe901f0535933a5d99485a4bf848f2f9203b8be697ae' 
  AND token = '7M6b16GfmEsJH34jCj/n/m3ibJhhc2ap+8GZRMpNuYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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