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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605559e0b9dab63b8aa3fdeca95eb314c14bac0d9e006d70d20d27d54eaefa56' 
  AND token = '86GKTdOQ3uLNIyA7mWqk/CcsoCyw6cVNTJLraQv34/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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