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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a07d0853674458cbfe62a34e08a9e1d9fc02a48e14861cf0dffd5810dbf832' 
  AND token = '2ZjUWnfkHL7J8exyhdXIhu62mJSRBWreZjNxy03T8Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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