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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb45d49222f2e4522070f052c2df23aacba56366890d7eb50a15adaf355048fd' 
  AND token = '8xfl9Hcdt/kTA0BaeR73CHwnih2kPQ6Q13V9P2WxEuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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