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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f91577bda285b9a49f41facb706077a7230da5174973e83fc80dc421e78fd5' 
  AND token = 'uYvNRfiVLXt4f6AIJj0QRXGloM3qlvJ5CiyiOTygfxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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