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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a7632ca20377ea91fc2e6410d7663d0deb9775ab3ccc0fb6904a711569a06f' 
  AND token = 'jWJ/k+etWtjBBVwdd4rIa9cI7xyV4JHhpLy2a91AvLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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