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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5617455aee9eafabe3200350cbb358c59f44344cefc0f8045f51febaa674eb5d' 
  AND token = 'dUPig3rZCTkEO0CT6weOR+8XpoItSWlHykbwn/0T1M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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