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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fd005e3cd3011dc168ea8f3ed5ce219245a2bb0fb95de5240327b285c69c25' 
  AND token = 'sWt4Hg3ZbdSLVGXgu6Pd76BGHyoI3QIC9wxWQgzWkhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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