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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a982009800ff5f4991956919d3f1f4dc1f1f53122b7e0fd66138d293a292a67d' 
  AND token = 'sr9j8iQxrASadHl5KqAQC3JD432N6cLAhTZ+bdJ1Oec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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