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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35fdc92666da8d4b9827c6e62cc89459a79792733cdedebcb2c5a2c351866a0' 
  AND token = '1Wm89NcrnAYRaPuTcOcmpOyeix/vmcEZHn0yghgfxUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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