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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5632ece1ff15be76e135bd15c28b985f6f78b40b6b83f69ea440ea453e6600' 
  AND token = 'A5oZ91f4HMTxytBBXnmYmLs3HHIv1vFdJMewOT9u7mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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